html, body {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
}

body {
    background: #2b89d1;
    background-image: -webkit-radial-gradient(top, circle cover, #2b89d1 0%, #d2eefc 100%);
    background-image: radial-gradient(top, circle cover, #2b89d1 0%, #d2eefc 100%);
    background-image: url(https://poemschina.com/site/mlrcn/bg.jpg);
    background-position: center center;
    background-repeat: no-repeat;
    background-size: cover;
}

.main {
    text-align: center;
    margin: 0 auto;
    position: relative;
    top: 30%;
    transform: translateY(-50%);
}


.logo img {
    width: 100px;
}

.tips {
    margin: 20px;
    letter-spacing: 2px;
    color: white;
    font-weight: bold;
}

.b1 {
    font-size: 32px;
}

.b2 {
    font-size: 20px;
}

.b3 {
    font-size: 16px;
}

.tips div {
    padding: 10px;
}

.chat {
    padding: 30px;
}

    .chat a {
        color: #fff;
        background-color: #2b89d1;
        padding: 6px 24px;
        font-size: 18px;
        font-weight: 400;
        cursor: pointer;
        border: 1px solid transparent;
        border-radius: 4px;
        letter-spacing: 2px;
        text-decoration: none;
    }

.yqlj {
    position: absolute;
    left: 60px;
    bottom: 30px;
}

.site a {
    text-decoration: none;
    font-size: 12px;
    color: #e2dde1;
}

.site b {
    font-size: 12px;
    color: #e2dde1;
}

.sep {
    display: inline-block;
    height: 12px;
    vertical-align: middle;
    margin: 0 10px;
    border-right: 1px solid #e2dde1;
}

.copyright {
    position: absolute;
    bottom: 30px;
    right: 60px;
    color: #e2dde1;
    font-size: 12px;
    text-align: right;
}

.none {
    display: none;
}

.key {
    display: none;
}

@media (max-width: 640px) {
    .logo img {
        width: 80px;
    }

    .tips {
        margin: 10px;
        letter-spacing: 1px;
    }

        .tips div {
            padding: 5px;
        }

    .b1 {
        font-size: 20px;
    }

    .b2 {
        font-size: 16px;
    }

    .b3 {
        font-size: 12px;
    }

    .chat input {
        font-size: 12px;
        letter-spacing: 1px;
    }

    .yqlj {
        display: none;
    }

    .copyright {
        bottom: 10px;
        width: 100%;
        right: 0;
        text-align: center;
    }
}